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- Question 1 of 11
1. Question
The tail of a comet is directed away from the sun because: [1997]
CorrectThe radiation emitted by sun exerts a radial presssure on the comet. So the tail of comet is always directed away from the sun.
IncorrectThe radiation emitted by sun exerts a radial presssure on the comet. So the tail of comet is always directed away from the sun.
UnattemptedThe radiation emitted by sun exerts a radial presssure on the comet. So the tail of comet is always directed away from the sun.
- Question 2 of 11
2. Question
A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its: [2000]
CorrectA black hole is a region of space from which nothing, not even light, can escape. It is the result of the deformation of spacetime caused by a very compact mass. The simplest black hole has mass but neither electric charge nor angular momentum. The mass of a black hole is finite, the reason why a black hole has infinite density is that it’s mass is concentrated into a space of zero-volume. Thus, it has a very high density.
IncorrectA black hole is a region of space from which nothing, not even light, can escape. It is the result of the deformation of spacetime caused by a very compact mass. The simplest black hole has mass but neither electric charge nor angular momentum. The mass of a black hole is finite, the reason why a black hole has infinite density is that it’s mass is concentrated into a space of zero-volume. Thus, it has a very high density.
UnattemptedA black hole is a region of space from which nothing, not even light, can escape. It is the result of the deformation of spacetime caused by a very compact mass. The simplest black hole has mass but neither electric charge nor angular momentum. The mass of a black hole is finite, the reason why a black hole has infinite density is that it’s mass is concentrated into a space of zero-volume. Thus, it has a very high density.
- Question 3 of 11
3. Question
Consider the following statements in respect of India advanced satellite INSAT–4A: [2006]
1. INSAT-4A was launched in December, 2005 from New Mexico.
2. The European Commercial Launch Service Provider Arianespace was associated with the launch of INSA T-4A.
3. Tata-Sky; a digital cable service provider; is associated with DTH television broadcasting service from INSA T-4A.
Which of the statements given above are correct?CorrectStatement ‘2’ and ‘3’ is correct, but ‘1’ is incorrect. Because INSAT–4A was launched on 22 December 2005 from French Guiana.
IncorrectStatement ‘2’ and ‘3’ is correct, but ‘1’ is incorrect. Because INSAT–4A was launched on 22 December 2005 from French Guiana.
UnattemptedStatement ‘2’ and ‘3’ is correct, but ‘1’ is incorrect. Because INSAT–4A was launched on 22 December 2005 from French Guiana.
- Question 4 of 11
4. Question
In which of the following activities are Indian Remote Sensing (IRS) satellites used? [2015]
1. Assessment of crop productivity
2. Locating groundwater resources
3. Mineral exploration
4. Telecommunications
5. Traffic studies
Select the correct answer using the code given below.CorrectIndian Remote Sensing (IRS) satellites are used in Assessment of crop productivity, Locating groundwater resources and Mineral exploration. This system was launched in 1979 and 1981. This system is used in agriculture, water resources, forestry and ecology, geology, marine fisheries and coastal management. It is the largest constellation of the remote sensing satellites.
IncorrectIndian Remote Sensing (IRS) satellites are used in Assessment of crop productivity, Locating groundwater resources and Mineral exploration. This system was launched in 1979 and 1981. This system is used in agriculture, water resources, forestry and ecology, geology, marine fisheries and coastal management. It is the largest constellation of the remote sensing satellites.
UnattemptedIndian Remote Sensing (IRS) satellites are used in Assessment of crop productivity, Locating groundwater resources and Mineral exploration. This system was launched in 1979 and 1981. This system is used in agriculture, water resources, forestry and ecology, geology, marine fisheries and coastal management. It is the largest constellation of the remote sensing satellites.
- Question 5 of 11
5. Question
Consider the following statements in respect of a jet engine and a rocket: [2008]
1. A jet engine uses the surrounding air for its oxygen supply and so is unsuitable for motion in space.
2. A rocket carries its own supply of oxygen in the gas form, and fuel.
Which of the statements given above is/are correct?CorrectA jet engine combines oxygen from the air with fuel at high temperature. There is usually a spark to ignite the fuel vapor, but once the engine begins turning, it will continue running until it runs out of fuel or air. A rocket, carries its own supply of oxygen for combustion.
IncorrectA jet engine combines oxygen from the air with fuel at high temperature. There is usually a spark to ignite the fuel vapor, but once the engine begins turning, it will continue running until it runs out of fuel or air. A rocket, carries its own supply of oxygen for combustion.
UnattemptedA jet engine combines oxygen from the air with fuel at high temperature. There is usually a spark to ignite the fuel vapor, but once the engine begins turning, it will continue running until it runs out of fuel or air. A rocket, carries its own supply of oxygen for combustion.
- Question 6 of 11
6. Question
Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such as orbit when: [2011]
1. The orbit is geosynchronous.
2. The orbit is circular.
3. The orbit lies in the plane of the earth’s equator.
4. The orbit is at an altitude of 22,236.
Select the correct answer using the codes given below:CorrectA geostationary orbit (or Geostationary Earth Orbit – GEO) is a geosynchronous orbit directly above the Earth’s equator (0° latitude), with a period equal to the Earth’s rotational period and an orbital eccentricity of approximately zero. It is the part of space about 35,786 km (22,236 miles) above sea level, in the plane of the equator, where near-geostationary orbits may be implemented.
IncorrectA geostationary orbit (or Geostationary Earth Orbit – GEO) is a geosynchronous orbit directly above the Earth’s equator (0° latitude), with a period equal to the Earth’s rotational period and an orbital eccentricity of approximately zero. It is the part of space about 35,786 km (22,236 miles) above sea level, in the plane of the equator, where near-geostationary orbits may be implemented.
UnattemptedA geostationary orbit (or Geostationary Earth Orbit – GEO) is a geosynchronous orbit directly above the Earth’s equator (0° latitude), with a period equal to the Earth’s rotational period and an orbital eccentricity of approximately zero. It is the part of space about 35,786 km (22,236 miles) above sea level, in the plane of the equator, where near-geostationary orbits may be implemented.
- Question 7 of 11
7. Question
An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth [2011]
CorrectAn artificial satellite moving round the Earth in a circular orbit possesses an acceleration which is “constant” in magnitude but “changing in direction”. An artificial satellite revolves round the earth under centripetal acceleration. By the launch rocket, immediately before the satellite is established in the predetermined orbit, the speed given to it is 30, 000 km/hr. The speed must be great enough so gravity doesn’t bring the satellite back to Earth, but not so great that the satellite escapes gravity out into space. This means that the speed, which is provided by the rocket is the source of the centrifugal force, and the attraction of the earth holds it from moving away from this centrifugal force.
IncorrectAn artificial satellite moving round the Earth in a circular orbit possesses an acceleration which is “constant” in magnitude but “changing in direction”. An artificial satellite revolves round the earth under centripetal acceleration. By the launch rocket, immediately before the satellite is established in the predetermined orbit, the speed given to it is 30, 000 km/hr. The speed must be great enough so gravity doesn’t bring the satellite back to Earth, but not so great that the satellite escapes gravity out into space. This means that the speed, which is provided by the rocket is the source of the centrifugal force, and the attraction of the earth holds it from moving away from this centrifugal force.
UnattemptedAn artificial satellite moving round the Earth in a circular orbit possesses an acceleration which is “constant” in magnitude but “changing in direction”. An artificial satellite revolves round the earth under centripetal acceleration. By the launch rocket, immediately before the satellite is established in the predetermined orbit, the speed given to it is 30, 000 km/hr. The speed must be great enough so gravity doesn’t bring the satellite back to Earth, but not so great that the satellite escapes gravity out into space. This means that the speed, which is provided by the rocket is the source of the centrifugal force, and the attraction of the earth holds it from moving away from this centrifugal force.
- Question 8 of 11
8. Question
‘Project Loon’, sometimes seen in the news, is related to [2016]
Correct(i) Project loon is a network of balloons travelling on the edge of space, designed to extend internet connectivity to people in rural & remote areas worldwide.
(ii) Under Project Loon, Google Inc. aims to provide internet connectivity via using helium balloons. Hence (b) is the apt choice.Incorrect(i) Project loon is a network of balloons travelling on the edge of space, designed to extend internet connectivity to people in rural & remote areas worldwide.
(ii) Under Project Loon, Google Inc. aims to provide internet connectivity via using helium balloons. Hence (b) is the apt choice.Unattempted(i) Project loon is a network of balloons travelling on the edge of space, designed to extend internet connectivity to people in rural & remote areas worldwide.
(ii) Under Project Loon, Google Inc. aims to provide internet connectivity via using helium balloons. Hence (b) is the apt choice. - Question 9 of 11
9. Question
With reference to ‘Li-Fi’, recently in the news, which of the following statements is/are correct? [2016]
1. It uses light as the medium for high-speed data transmission.
2. It is a wireless technology and is several times faster than ‘Wi-Fi’.
Select the correct answer using the code given below.Correct(i) This OWC technology uses light from light-emitting diodes (LEDs) as a medium to deliver networked, mobile, high-speed communication in a similar manner to Wi-Fi. It is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi.
(ii) Li-fi gives data transfer rate of 10 gigabytes per second. So 1st statement is right. Li-Fi device circulates data via LEDs that emit an intermittent flicker at a speed imperceptible to the human eye. So, 2nd statement also right.Incorrect(i) This OWC technology uses light from light-emitting diodes (LEDs) as a medium to deliver networked, mobile, high-speed communication in a similar manner to Wi-Fi. It is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi.
(ii) Li-fi gives data transfer rate of 10 gigabytes per second. So 1st statement is right. Li-Fi device circulates data via LEDs that emit an intermittent flicker at a speed imperceptible to the human eye. So, 2nd statement also right.Unattempted(i) This OWC technology uses light from light-emitting diodes (LEDs) as a medium to deliver networked, mobile, high-speed communication in a similar manner to Wi-Fi. It is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi.
(ii) Li-fi gives data transfer rate of 10 gigabytes per second. So 1st statement is right. Li-Fi device circulates data via LEDs that emit an intermittent flicker at a speed imperceptible to the human eye. So, 2nd statement also right. - Question 10 of 11
10. Question
What is the purpose of ‘evolved Laser Interferometer Space Antenna (eLISA)’ project? [2017]
CorrecteLISA aims to measure gravitational waves in the frequency range from 0.1 mHz to about 100 mHz.
IncorrecteLISA aims to measure gravitational waves in the frequency range from 0.1 mHz to about 100 mHz.
UnattemptedeLISA aims to measure gravitational waves in the frequency range from 0.1 mHz to about 100 mHz.
- Question 11 of 11
11. Question
The terms ‘Event Horizon’, ‘Singularity’, ‘String Theory’ and ‘Standard Model’ are sometimes seen in the news in the context of [2017]
CorrectNature is governed by four fundamental forces – electromagnetic, strong, weak and gravitational. Standard Model explains the first three forces.
• Event horizon is the imaginary boundary surrounding the black hole from beyond which light cannot escape and The singularity constitutes the centre of a black hole and is hidden by the object’s “surface”.
• All these point to answer “A”.IncorrectNature is governed by four fundamental forces – electromagnetic, strong, weak and gravitational. Standard Model explains the first three forces.
• Event horizon is the imaginary boundary surrounding the black hole from beyond which light cannot escape and The singularity constitutes the centre of a black hole and is hidden by the object’s “surface”.
• All these point to answer “A”.UnattemptedNature is governed by four fundamental forces – electromagnetic, strong, weak and gravitational. Standard Model explains the first three forces.
• Event horizon is the imaginary boundary surrounding the black hole from beyond which light cannot escape and The singularity constitutes the centre of a black hole and is hidden by the object’s “surface”.
• All these point to answer “A”.